﻿<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="utf-8" />
    <title></title>
    <style>
        #result {
            width: 200px;
            height: 100px;
            border: solid 1px #90b;
        }
    </style>
</head>
<body>
    <div id="result"></div>

    <script>
        //获取元素对象
        const result = document.getElementById("result");

        //绑定事件
        result.addEventListener("mouseover", function () {
            //1、创建对象
            const xhr = new XMLHttpRequest();
            //2、初始化  设置类型与URL
            xhr.open('POST', 'http://127.0.0.1:8000/server');

            //设置请求头
            xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
            xhr.setRequestHeader('name', 'jike');
            //3、发送
            //xhr.send('a=100&b=200&c=300');
            xhr.send('a:100&b:200&c:300');
            //4、事件绑定
            xhr.onreadystatechange = function () {
                if (xhr.readyState === 4) {
                    if (xhr.status >= 200 && xhr.status < 300) {
                        //处理服务端返回的结果
                        result.innerText = xhr.response;
                    }

                }
            }
        });
    </script>
</body>
</html>